Hi to you all, having one of those days where I just cant seem to get the brain working right. could someone please point me in the right direction for the trigonometry formula for finding point B on the drawing. Point A is at X-30.0 Y0.0

I know I have drawn it up on the CAM system and have already got the co-ordinates of point B but just want to find the traditional calculation method too.

Many thanks.